Intermediates for preparing hydroxyphenylpyridazinones
申请人:SmithKline Corporation
公开号:US04272440A1
公开(公告)日:1981-06-09
5-(5'-Halo-2'-methoxyphenyl)-3,4-dihalo-2(5H)-furanones are prepared by a Friedel-Crafts reaction using a p-haloanisole and a mucohalic acid in the presence of aluminum chloride. They are used as chemical intermediates for preparing hydroxyphenylpyridazinones.